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crossnumbers sequences numbers folding tube maps christmas fractions pascal's triangle planes the only crossnumber binary proportion trigonometry number squares indices means square grids chess products addition square numbers 2d shapes division people maths irreducible numbers hexagons advent doubling taxicab geometry consecutive integers multiples quadratics angles ave scales time pentagons perimeter tangents probabilty odd numbers 3d shapes multiplication cryptic clues integers sport matrices digits complex numbers cards floors polynomials games balancing star numbers percentages remainders sum to infinity surds coins books axes chocolate unit fractions tiling volume neighbours lists cube numbers dates elections partitions prime factors ellipses digital clocks polygons algebra median quadrilaterals powers combinatorics range sums factors gerrymandering circles decahedra even numbers wordplay geometric means shape triangles coordinates grids medians palindromes area consecutive numbers colouring triangle numbers money chalkdust crossnumber arrows averages calculus geometric mean cryptic crossnumbers spheres factorials speed lines crosswords parabolas square roots clocks xor perfect numbers integration dice digital products symmetry dominos albgebra menace routes logic sets rugby graphs mean multiplaction squares prime numbers tournaments differentiation probability dodecagons expansions shapes bases regular shapes functions geometry cubics rectangles determinants